package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.elasticsearch.search.sort.SortOrder;

import javax.swing.*;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client ;
    @Autowired
    ProductFeignService productFeignService ;
    @Override
    public SearchResult search(SearchParam param) {
        SearchResult  result  = null ;
//      1  准备检索请求
        SearchRequest searchRequest = bulidSearchRequest(param);
        try {
//     2       执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTION);
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest bulidSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder  = new SearchSourceBuilder();//构建DSL语句

//        查询模糊匹配过滤（按照属性，分类品牌价格区间库存）
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery() ;
        //must模糊 匹配
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        if(param.getAttrs()!=null && param.getAttrs().size()>0){
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个必须生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        if(param.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock() == 1));
        }
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if(s.length == 2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }

            }
            boolQuery.filter(rangeQuery);
        }

//        把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);
        /**
         * 排序,分页,高亮
         */
        if(!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order=s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder) ;
        }


        /**
         * 聚合分析
         */
//    1    品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

//     1.1品牌   子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
//      TODO 1集合brand
        sourceBuilder.aggregation(brand_agg);
//       2 分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
       // TODO 2聚合catalog
        sourceBuilder.aggregation(catalog_agg);
//        3  属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合分析出当前attr对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue")).size(50);

        attr_agg.subAggregation(attr_id_agg);
        // TODO 3聚合attr
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL:"+s);


        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest  ;
    }
    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>() ;
        if(hits.getHits()!=null && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel sku = new SkuEsModel() ;
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);

            }
        }
        //1返回的所有查询到的商品
        result.setProducts(esModels);
//        2当前所有商品涉及到的所有属性信息

        List<SearchResult.AttrVo>  attrVos= new ArrayList<>() ;
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo =  new SearchResult.AttrVo();
//            得到属性 的Id
            long attrId = bucket.getKeyAsNumber().longValue();
//            属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
//            属性的名字
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
//        3当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo>  brandVos = new ArrayList<>() ;
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo =  new SearchResult.BrandVo();
//            得到品牌的Id
            long brandId = bucket.getKeyAsNumber().longValue();
//            得到品牌的名字
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
//            得到品牌的图片
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
//        4当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类Id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        5分类信息-页码
        result.setPageNum(param.getPageNum());
//        5分类信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//        5分类信息-总页码
        int totalPages = (int) (total%EsConstant.PRODUCT_PAGESIZE == 0?(int)total/EsConstant.PRODUCT_PAGESIZE:(int)(total/EsConstant.PRODUCT_PAGESIZE+1));
        result.setTotalPges(totalPages);
        List<Integer> pageNavs = new ArrayList<>() ;
        for (int i = 1; i <totalPages ; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //构建面包屑导航功能
        if(param.getAttrs()!=null && param.getAttrs().size()>0){
        List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            String[] s = attr.split("_");
            navVo.setNavValue(s[1]);
            R r = productFeignService.attrInfo(Long.parseLong(s[0]));
            result.getAttrIds().add(Long.parseLong(s[0]));
            if(r.getCode() == 0){
                AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                });
                navVo.setNavName(data.getAttrName());
            }else{
                navVo.setNavName(s[0]);
            }

            //取消了这个面包屑以后，我们要跳转到哪个地方
            String replace = replaceQueryStrirng(param, attr,"attrs");
            navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            return navVo;
        }).collect(Collectors.toList());

        result.setNavs(collect);
        }
        //品牌，分类
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            List<SearchResult.NavVo> navVos = result.getNavs() ;
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace="";
                for (BrandVo brandVo : brand) {
                    log.info(brandVo.getBrandId().toString());
                    log.info(brandVo.getName()+"314");
                    buffer.append(brandVo.getName()+";");
                    replace = replaceQueryStrirng(param,brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }
           navVos.add(navVo);
        }
        //TODO 分类 不需要导航取消








        return  result ;
    }

    private String replaceQueryStrirng(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode.replace("+","%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode, "");
    }
}
